Abstract:

We review the basic ideas of holographic LEED, and the latest progress
in the field. We compare several proposed computer reconstruction schemes.
Using experimental diffuse LEED data from O/Ni(001) and K/Ni(001)
surfaces, we show that the capability now exists for filtering out the
effects on the diffraction patterns of possible long-range order amongst the
adsorbates, thus making holographic LEED much more analogous to photoelectron
holography. Inclusion of a scattered-wave kernel to compensate for the
variation of the magnitude of the reference-wave at the positions of potential
object-wave sources enables the reconstruction of a fully three-dimensional
image of substrate atoms in the immediate vicinity of atomic adsorbates from
a set of just normal-incidence diffuse LEED patterns.